Improvement in chalk-erasers



UNITED STATES cEoReEMUNcEE, on NEW. HAVEN, CONNECTICUT, ASSIGNOR TOHIMSELF,

PATENT OFFI E.

L. CANDEE, AND J. E. P. 'DEAN, OF SAME PLACE.

IMPROVEMENT IN CHALK-ERASERS;

Specification forming part of Letters Patent No. 33,684, dated November-5, 1861.-

To all whom it may concern.-

Be it known that I, GEORGE MUNGER, .of New Haven, in the county of NewHaven and State of Connecticut, have invented a new and Improved Rubber,the same being designed for rubbing off chalk-marks-from blackboards,cleaning windows, and for similar or analogous purposes; and I do herebydeclare thatthe following isa full, clear, and exact description of thesame, reference being had to the annexed drawings, .making a part ofthis specification, in which- Figure 1 is a perspective View of myinvent-ion. Fig. 2 is a central transverse section of the same. PSimilar letters of reference indicate correspondingparts in the'twofigures.

The object of this invention is to' obtain a- I simple and durabledevice by which chalkmarks may be rubbed 0% from blaokboards without theaid of. moisture, the invention also serving as an excellent device forrubbing and cleaning the glass of windows, mirrors, &c. 1 4

The invention consists in having a series of strips of cliainois orsheep skin or other similar soft leatheror cloth fitted in a block orholder, as hereinafter described, to etfec the desired end.

To enable those skilled in the art to. fully understand and construct myinvention, I will .proceed to desoribeit.

Arepresents a rectangular block, which may be of wood and provided atits outer side, with a handle B. The face side of the block A is groovedlongitudinally, as shown at a, the grooves being at suitable distancesapart and parallel with each other. The grooves a extend the wholelength of the block A, and

in each groove a strip 'o of chamois or sheep skin or cloth is fitted,said strips being doubled or-folded longitudinally and the folded edgesbeing-fitted in the grooves and seen redth ere'in by any suitable'glueor cement. The grooves a are at sucha distance apart and the leatherstrips 1) of such a width that the latter will completely cover the faceof the block 'A, as

' will be fully understood by referring to both figures. The strips 1)are the rubbing medium, and it will be seen that by having them fittedin the block A, as shown, a great wear.- ing-surface is obtained, and inmoving or operating the block A back and forth the strips 1) will moveor vibrate back and forth and operate very efficiently i'n rubbing outchalkmarks orin polishing a surface, such as glass A plain or smoothcushion, it will be perceived, would soon wear out, as a singlethickness of the skin is all that is subjected to wear, whereas by my invention the whole width of the strips I) require to be worn ou-t= GEO.'MUNGER.

\Vitnesses:

'BENJ. BEECH THEO. .S. BEE HEE.

